strange behavior duplicating objects in blender 2.8
I think there may be a few problems. Either this is a Blender glitch, in which the answer for that case is to restart Blender, or you may have set the objects to be linked when you duplicate them. You can fix this by looking at the options Blender shows on the left when you duplicate the object. If the box shows "linked" as being checked, then click that to unset linking the objects when duplicating. Also, perhaps, it may be because you hit enter to confirm the duplication. If you left-click the mouse (or track-pad), it will also confirm the duplication's location. Right-clicking keeps the duplicated object at the first object's location, but keeps the duplication.